Matos, B. R.
de Florio, D. Z.
Rey, J. F. Q.
Santiago, E. I.
Fonseca, F. C.
Total Authors: 6
 Natl Ctr Res & Mat Sci CNRSM, Cedria Sci & Technol Pk, Hammam Chatt 1164 - Tunisia
 Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo, SP - Brazil
 Univ Fed ABC, BR-09090400 Santo Andre, SP - Brazil
Total Affiliations: 3
MATERIALS FOR RENEWABLE AND SUSTAINABLE ENERGY;
Web of Science Citations:
Nafion-mesoporous silica composites were investigated aiming at improved performance of direct ethanol fuel cells (DEFC) operating at high temperature. Mesoporous silica (MPS) was synthesized by a sol-gel technique and added as the inorganic filler into Nafion membranes by casting process. The performance of DEFC using both Nafion and Nafion-MPS composites were evaluated by polarization curves and correlated to the electrical and structural properties of the electrolytes in ethanol environment inferred by impedance spectroscopy and small angle X-ray scattering, respectively. The main results show that Nafion-MPS composite electrolytes exhibit improved performance that was related to a structural pining of the ionic clusters of ethanol-saturated Nafion by the inorganic particles, which resulted in higher proton conductivity of the composite. The experimental results evidenced the relevance of a better understanding of the properties of Nafion-based electrolytes to further develop the direct alcohol fuel cells technology. (AU)